The best system would be for the fuge to flow back to the tank without the use of pumps, but who likes to have that much water sitting that high.
Also kind of un-clear in the picture where the outlet of the skimmer is, but don't forget about the bubbles.
Personaly I like having the fuge in the middle of my sump, but it is a pain cleaning the intake of my return pump every week or 2. I could fix it but that would mean more baffles.
Here is an old pick from 2001 of my sump:
I don't have the LG pump anymore, using a MAK4 for now. Also don't have the partial recirc line on the return pump, since I changed my overflow screens, but better flow. Don't have double valve on the outlet of the Iwaki pump anymore, I just take the hose off and put another one on to pump out my water for water changes. Other wise it's still the same, fuge is completly full of caulerpa. I have 2x55w PC over the fuge now, first tried 2x 36" NO but they just wouldn't cut it.
If you ever want to clean the baffles, you need more room or very small hands, I would have gone bigger had I known at the time. Also could use more to keep the bubble under better control, if I did not have the algea to help.
Lee